## Summary
- Restores Node.js 20 LTS to the Forgejo runner job image
- `actions/checkout@v4` and other JavaScript Actions require `node` in the job container
- The Phase 3 simplification (PR #162) accidentally removed it, breaking all CI runs
## Changes
- `containers/forgejo-runner/Dockerfile`: Add `gnupg` (for nodesource GPG key) and Node.js 20 via nodesource
- Changelog fragment
## Test plan
- [ ] Merge, release as `forgejo-runner-v3.0.1`
- [ ] Update runner manifest to v3.0.1, sync, restart pod
- [ ] Trigger a workflow_dispatch and verify `actions/checkout` succeeds
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Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/163
